Molecular interactions in ternary mixtures of non-electrolytes: Molar excess volumes

Abstract

Molar excess volumes, V E ijk , of 1,2-dichloroethane ( i)+pyridine ( j)+α-picoline ( k), + n-heptane ( j)+pyridine ( k), + α-picoline ( k), n-heptane ( i)+pyridine ( j)+ α-picoline ( k), aniline ( i)+pyridine ( j)+α-picoline ( k) and + γ-picoline ( k) mixtures have been measured dilatometrically at 298.15 K. The data have been examined in terms of the Sanchez and Lacombe theory and the graph-theoretical approach and they were found to be described better by the latter. Self- and cross-volume interaction coefficients, V jk , V jjk and V jkk , etc., have also been determined and the values utilized to study molecular interactions between the jth and kth in the presence of the ith molecular species in these i + j + k mixtures.